Question about Dell OptiPlex SX270 PC Desktop

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Dell sx270 optiplex

System went down on Sunday. Power supply was not the problem. Holding the power button in for 10 secs or replacing the flea battery did not help. I believe it is the motherboard. How do I remove/replace the motherboard? Are there a set of instructions somewhere?


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  • mullantl Feb 23, 2008

    Thanks to all;

    I have taken all of your suggestions and comments and considered them carefully. Thanks so much for all your help.

    I was able to find the dell *.pdf file as noted via hyerlink w/ my tag # and removed the motherboard for a closer look. Pretty easy, I was a bit nerves about playing with the processor/heatsheild, but once I got a closer look I figured out that it just pops out revealing the 4 green screw on the board. I was able to determine the CN# as H1229.

    To answer the issue of why I think it is the board. I spoke with Dell support several times and went through their long methodology of testing the AC Power supply as well as purchasing an inexpensive new one of of ebay. The 5 capacitors marked 'X' are slightly domed on top. The ones marked 'K' and 'T' are flat. Nothing leaks or is swollen. For the most part the systems is the way I purchased it 5 years ago, but I did upgrade the RAM. There has been no other changes. Even with a new AC power supply, used in different outlets (of course), the systems will not post, which is to say that there is no 'amber' or 'green' light activity on the power button at all.

    I will air off the board and try to test it again as a last ditch effort before I consider a new board. Much of what I see is a direct replacement for H1229, but it is earmarked foe a GX270 system.

    I would like to consider a possible fix (replacing the capacitors) if it is not to expensive, in the Northern Va area. The future of this systems is to be used for a cocktail gaming table / spare emergency computer. I think this would be just fine.

    Thanks again for your suggestions;


  • Anonymous Jun 11, 2008

    Where to get new capacitors

  • Troy Scott
    Troy Scott May 11, 2010

    How do you know it is dead? What exactly did it do?



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Its easy on most dells, open the case, disconnect all the cables and remove anything in the way, then just unscrew the boards fastening screws that hold it down. Sometimes its a single screw that holds the board in place, once removed, the board slides out. First try reseating everything, Pull out the memory and put it back in, same for the video card and any other devices, unplug it also and pull out the bios battery for 30 seconds so everything resets.

If the Capacitors on the mother board are swollen or have discharge, then the board is what went bad, The capacitors are the round black cyclinders that stick up from the board, there supposed to have flat tops, like tiiny little soda cans, but when they get heat damage or go bad, the get domes and split at the top and eventually rupture.

Here is the link to the dell site for the repair manual.

You can also go to ( )

In the middle it has a link to MANUALS, then it has a way for you to look it up by make and model of your PC.

Posted on Feb 23, 2008

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Always start with the simplest solutions. Make sure the wall outlet isn't blown. Check to make sure you power bar isn't shut off.

If those aren't the problems, please give a more detailed description of what you were doing last, what you were downloading (inf anything). Sites you visited...any hardware changes...bios updates..cmos changes....

Posted on Feb 23, 2008

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